When you're logged into Greenhouse Recruiting using Single Sign-On (SSO), you won't see the Log Out button under your initials in the top right corner of the page.
The process to log out when using SSO differs based on your organization's specific configuration, but in general, to log out of Greenhouse Recruiting, you'll need to log out of that provider.
Typically, when you log out of your SSO provider, you'll also log out of any other applications (like email, timecards, or other websites) where you're logged in using SSO.